MIC4576WU Micrel Inc, MIC4576WU Datasheet

MIC4576WU

Manufacturer Part Number

MIC4576WU

Description

IC REG 200KHZ 3.0A ADJ TO-263-5

Manufacturer

Micrel Inc

Type

Step-Down (Buck)r

Datasheet

1.MIC4576WU_TR.pdf (8 pages)

Specifications of MIC4576WU

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

1.23 ~ 33 V

Current - Output

Frequency - Switching

200kHz

Voltage - Input

4 ~ 36 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

D²Pak, TO-263 (5 leads + tab)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Other names

576-3378-5
MIC4576WU

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MIC4576WU

Manufacturer:

MICREL

Quantity:

10 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

MIC4576WU

Manufacturer:

MICREL/麦瑞

Quantity:

20 000

Company:

H&T Electronics

Part Number:

MIC4576WU

Quantity:

5 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

MIC4576WU-TR

Manufacturer:

MICREL/麦瑞

Quantity:

20 000

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Download datasheet (213Kb)

General Description

The MIC4576 is a series of easy to use ﬁxed and adjustable

BiCMOS step-down (buck) switch-mode voltage regulators.

The 200kHz MIC4576 duplicates the pinout and function of

the 52kHz LM2576. The higher switching frequency may

allow up to a 2:1 reduction in output ﬁlter inductor size.

The MIC4576 is available in 3.3V, and 5V ﬁxed output ver-

sions or a 1.23V to 33V adjustable output version. Both

versions are capable of driving a 3A load with excellent line

and load regulation.

The feedback voltage is guaranteed to ±2% tolerance for

adjustable versions, and the output voltage is guaranteed to

±3% for ﬁxed versions, within speciﬁed voltages and load con-

ditions. The oscillator frequency is guaranteed to ±10%.

In shutdown mode, the regulator draws less than 200µA

standby current.

current limiting and thermal shutdown for protection under

fault conditions.

This series of simple switch-mode regulators requires a mini-

mum number of external components and can operate using

a standard series of inductors. Frequency compensation is

provided internally.

The MIC4576 is available in TO-220 (T) and TO-263 (U)

packages for the industrial temperature range.

Typical Applications

March 2006

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

The regulator performs cycle-by-cycle

16V to 36V

Shutdown

Enable

470µF

63V

8V to 36V

Shutdown

Enable

470µF

63V

SHDN

MIC4576WT

SHDN

MIC4576-5.0WT

GND

Adjustable Regulator

GND

Fixed Regulator

Features

• Fixed 200kHz operation

• 3.3V, 5V, and adjustable output versions

• Voltage over speciﬁed line and load conditions:

• Guaranteed 3A switch current

• Wide 4V to 36V input voltage range

• Wide 1.23V to 33V output voltage range

• Requires minimum external components

• < 200µA typical shutdown mode

• 75% efﬁciency (adjustable version > 75% typical)

• Standard inductors are 25% of typical LM2576 values

• Thermal shutdown

• Overcurrent protection

• 100% electrical thermal limit burn-in

Applications

• Simple high-efﬁciency step-down (buck) regulator

• Efﬁcient preregulator for linear regulators

• On-card switching regulators

• Positive-to-negative converter (inverting buck-boost)

• Battery Charger

• Negative boost converter

• Step-down to 3.3V for Intel Pentium™

and similar microprocessors

MBR360

Fixed version: ±3% max. output voltage

Adjustable version: ±2% max. feedback voltage

68µH

MBR360

200kHz Simple 3A Buck Regulator

33µH

13.0k

1.50k

5V/3A

1000µF

16V

12V/3A

MIC4576

1000µF

16V

MIC4576

Related parts for MIC4576WU

MIC4576WU Summary of contents

Page 1

General Description The MIC4576 is a series of easy to use ﬁxed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200kHz MIC4576 duplicates the pinout and function of the 52kHz LM2576. The higher switching frequency may allow up to ...

Page 2

... Ordering Information Standard RoHS Compliant Part Number Part Number* MIC4576-3.3BT MIC4576-3.3WT MIC4576-5.0BT MIC4576-5.0WT MIC4576BT MIC4576WT MIC4576-3.3BU MIC4576-3.3WU MIC4576-5.0BU MIC4576-5.0WU MIC4576BU MIC4576WU * RoHS compliant with "high-melting solder" exemption. Pin Conﬁguration Pin Description Pin Number Pin Name GND TAB 4 5 SHDN MIC4576 Voltage Temperature Range 3 ...

Page 3

Absolute Maximum Ratings Supply Voltage (V ) .................................................... +40V IN Shutdown Voltage (V ) ............................–0.3V to +36V SHDN Output Switch (V ), Steady State ............................... –1V SW Feedback Voltage (V ) [Adjustable] ......................... +3.8V FB Storage Temperature ................................ –65°C to ...

Page 4

Parameter Condition MIC4576 / -3.3 / -5.0 Oscillator Frequency Saturation Voltage I OUT Current Limit peak current, t Standby Quiescent Current V SHDN SHDN Input Logic Level V OUT V OUT SHDN Input Current V SHDN V SHDN General Note: ...

Page 5

Block Diagrams Shutdown Enable SHDN MIC4576-x.x Shutdown Enable SHDN MIC4576 March 2006 +36V max. V Internal Regulator Thermal Current Shutdown Limit 200kHz Oscillator Driver Com- parator 3A Switch 1.23V Bandgap Error Amp GND Block Diagram with External Components ...

Page 6

Functional Description The MIC4576 is a variable duty cycle switch-mode regulator with an internal power switch. Refer to the block diagrams. Supply Voltage The MIC4576 operates from a +4V to +36V unregulated input. Highest efﬁciency operation is from a supply ...

Page 7

SHDN SW MIC4576-5.0BT 8V to 24V GND 470µF 3 35V C1 Nichicon UPL1J471MPH, ESR = 0.046Ω C2 Nichicon UPL1C102MPH, ESR = 0.047Ω D1 Motorola MBR5822 L1 Coiltronics PL52C-33-1000, DCR = 0.036 L1 ...

Page 8

... REF) 0.065 ±0.010 20°±2° 0.067 ±0.005 DIM. = INCH MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel reserves the right to change circuitry and speciﬁcations at any time without notiﬁcation to the customer. ...

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